From owner-freebsd-scsi@FreeBSD.ORG Fri Apr 23 11:45:45 2004 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 63C4A16A4CE for ; Fri, 23 Apr 2004 11:45:45 -0700 (PDT) Received: from smtp.covadmail.net (mx07.covadmail.net [63.65.120.67]) by mx1.FreeBSD.org (Postfix) with SMTP id D2F3243D1D for ; Fri, 23 Apr 2004 11:45:44 -0700 (PDT) (envelope-from strick@covad.net) Received: (covad.net 2906 invoked from network); 23 Apr 2004 18:45:39 -0000 Received: from unknown (HELO mist.nodomain) (strick@covad.net@67.101.98.93) by sun-qmail02 with SMTP; 23 Apr 2004 18:45:39 -0000 Received: from mist.nodomain (localhost [127.0.0.1]) by mist.nodomain (8.12.9p2/8.12.9) with ESMTP id i3NIjcoK000415; Fri, 23 Apr 2004 11:45:39 -0700 (PDT) (envelope-from dan@mist.nodomain) Received: (from dan@localhost) by mist.nodomain (8.12.9p2/8.12.9/Submit) id i3NIjWMJ000414; Fri, 23 Apr 2004 11:45:32 -0700 (PDT) (envelope-from dan) Date: Fri, 23 Apr 2004 11:45:32 -0700 (PDT) From: Dan Strick Message-Id: <200404231845.i3NIjWMJ000414@mist.nodomain> To: schweikh@schweikhardt.net cc: freebsd-scsi@freebsd.org Subject: Re: Hardware Striping X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Apr 2004 18:45:45 -0000 >> > ... > I have two pairs of identical U160 SCSI disks > ... > Until now I'm using an Adaptec 29160 Host Adapter, but of course it is > not HW-RAID0 capable. What card am I looking for? > > The disks have a sustained read rate of 60 to 70 Mbyte/s, so if all of > them were used at the same time they could saturate an U160 bus. Is this > a problem? > ... >> We can assume that a high speed SCSI host adapter will have a faster PCI interface but the vast majority of even modern motherboards have only a traditional 33 MHz 32 bit PCI which would saturate well below 133 Mbyte/sec. What variety of PCI bus does your system have? Dan Strick strick@covad.net